Twin tires for motor vehicles



July 20, 1948. J. HjwlLLlAMs 2,445,503

`TWIN TIRES FOR MOTOR VEHICLES Filed sept. 21, 1944 JNVENToR.

Patented July 20,V 1948 OFFICE-:7'

TWIN TIRES FOR MOTOR VEHICLES John H. Williams,

St. Johns, Newfoundland, Canada application september 21, 1944, serialNo. 555,085

This invention relates to new and useful improvements in twin tires formotor vehicles.

More specifically, the invention proposes the construction of a twin-tire characterized by an outer casing of rubber having its interiordivided into separate chambers with a tube disposed in each chamber in amanner to form a tire which will not go flat if the air escapes from oneof the tubes permitting the vehicle to which it is applied to be drivenwithout requiring iin-mediate repairs to the deflated portion of thetire.

Still further, it is proposed to form the casing with a centrallylocated inwardly extending groove for separating the interior of thecasing into separate -chambers and to provide a filler within the casingdisposed `between the inner face of the groove and a remote wall of thecasing in a manner .to provide a surface against which the groove may beclamped to be retained in position against the outward pressure of thetubes when filled with air.

Another object of the invention proposes the provision of a novel meansfor clamping the groove in its operative position, with the means beingso arranged that it may be controlled by the application of a simplehand tool from the outside of the casing.

It is a further object of this invention, to construct a twin tire formotor vehicles which is simple and durable and which may be manufacturedand sold at a reasonable cost.

For further comprehension of the invention, and of the objects andadvantages thereof, rei?- erence will be had to the lfollowingdescription and accompanyying drawings, and to the appended `claims inwhich the various novel features of the invention are more particularlyset forth.

In the accompanying drawing forming a ma.- terial part of thisdisclosure:

Fig. 1 is a side elevational view of a twin tire constructed inaccordance with this invention.

Fig. 2 is an enlarged vertical sectional view taken on the line 2-2 ofFig. 1.

Fig. 3 is anenlarged partial longitudinal sectional view of Fig. 1.

The twin tires for motor vehicles, according to this invention, includesan outer casing I of yconventional rubber construction. The outer casingI0 is formed with an inwardly extending groove II which divides theinterior of the casing I0 into adjacent chambers I2 and I3. Aconventional tire tube I 4 is mounted in each of the chambers I2 and I3,and the tubes I4 are adapted to be lled with air in the conventionalmanner. Further details of the construction of the tubes 2 claims. (ci.152-352) I4 will not be giveninl this-specification,` as theirconstruction and manner of use is generally A v known in the art, andthe details thereof form part of this invention. f

A lle-r I 5 of rubber is mounted within the casing It and disposedbetween the inner face of the addition completes the separation of thecham-v bers I2 and I3 as shown in Fig. 2.

within the groove Il meansl is providedifof clamping the groove inposition against the filler I5. This means comprises a length of wire I6which is passed through lugs 2'I. The lugs 21 are integrally formed withthe casing within the groove Il. The ends of the wire I6 are threadedand are threadedly passed through collars 2'I mounted in the ends of atube |18 so that the ends are disposed within the tube. The ends .of thewire I6 are also formed with enlarged heads I9 located within the tubeI'8 which prevent the complete withdrawal of the ends of the wire fromthe tube.

Means is Iprovided for turning the tube I'8 to extend and retract theends of the wire I6. This means is characterized by spaced gear teeth 20formed on the tube I8. A bracket 2I is freely mounted on the tube I8between the gear teeth 20, and is formed at its outer end with anopening 22.

A turning tool 23, illustrated by dot and dash lines in Fig. 1, isformed at one end with a handle 24, and is adapted to have its free endinserted into the opening 22 in bracket 2| to provide a center pointabout which the tool may be turned. A gear 25 is mounted upon the tool23 at a location to mesh with one of the sets of gear teeth 20 formed onthe tube I8 when the end of the tool 23 is engaged with the opening 22from one side or the other of the bracket 2|. Rotations of the handle 24will then cause the tube I8 to be turned to extend or retract the endsof the wire I6 depending upon the direction in which the tool 23 isturned.

The manner of using the twin tire is as follows:

With the filler I5 removed each of the tubes I4 is engaged in positionwithin its respective chamber I2 or I3. The filler I5 is then returnedto its position with the casing I0 and the casing is placed in positionon the wheel rim. The wire I6 is then tightened to securely clamp thegroove I I against the filler I5. The tubes I4 are then 3 lled with air,and the wire I6 will preventl the casing l0 from being expanded to aposition in which the groove will be forced out of its normal position.

The feature of the invention resides in the fact that the double tubesI4 permit the car to be driven if one o1 the tubes becomes deflatedwithout requiring that the tire be immediately fixed.

While have VVillustrated and described the preferred'embodlmentsof myinvention, it is-to be understood that I do not limit myself to theprecise constructions herein disclosed and the right is reserved to al1changes and -rnodications coming within the scope of the invention asdefined in the appended claims. Y

Having thus described my invention, what I claim as new, and desire tosecure by United States Letters Patent, is:

1. A twin pneumatic tire comprising two heavy rubber flanges adapted tofit in a wheel rim and toY engage each other along ytheir inner faces, arubber mail connecting saidlanges and including the; tread of vsaidtire, said wall having .a middle portion extending inwardly 4toward butvnot 'to said:flange:inner faces, dividing the interior of saiiibvtirefinto--two lannular chambers, a separateannular;rubber'ringidisposed'between and in engagementnwdth: saldimiddle portion and said flanges, .closing oneofi said lcham-bers fromthe others-:of said chambers, said" middle portion invm cludingv twospaced Apartsforming a'groove therebetween, a rubber air-containing tubein each of said' chambers, andimeans in -sa'id-.groove holding saidmiddle portionfagainstr saidv ring.

2. A twin pneumatic tire comprising two heavy rubber flanges adapted tofit in a Wheel rim and to engage each other along their inner faces, arubber wall connecting said iianges and including the tread of saidtire, said Wall having a middle portion extending inwardly toward butnot to said ange inner faces, dividing the interior of said tire intotwo annular chambers, a separate 'annula'r lrubber iring .disposedbetween and in engagement withsaidlniiddle portion and said flanges,closing one of said chambers from the other of said chambers, saidmiddle portion Aincluding .two vspaced parts forming a groovetherebetween, a rubber airfcontaining tube in Aeach 'ofsaid chambers,and means in said groove 'holding said middle portion against said ring,

said means including a wire engaging the bottom of said groove andaturnbuckle securing the ends of .said wire together.

JOHN H. WILLIAMS.

REFERENCES. f CITED The-,following references fare-of rrecord in theile- Oi" this*- p'alleh' UNITED 'STATES PATENTSA

